Fresh Siteground Upfront installation fail

Referencing another thread ("Can't Edit Upfront: "Please, hold on for just a little bit more").

I am having the same issue. Your solution makes no sense to me:
placing the following snippet in your .htaccess file at the root of your site it will skip that rule and Upfront will work as normal.

<IfModule mod_security.c>
SecFilterRemove 00318
</IfModule>

I don't know how to do this, and I thus do not have a functional version of Upfront.